One man was killed, and two people were hurt when two cars collided on the busy roadway just before 9 a.m.

"We have members of the State Police Technical Accident Reconstruction Team on scene. They are going to be reconstructing the accident," Deputy Chief Rene Kelly told WMUR-TV.

Investigators said a Chrysler was traveling east on Route 4, and a Buick was going west. Witnesses said the driver of the Chrysler may have drifted into oncoming traffic, striking the Buick head-on.

The driver of the Buick, 74-year-old Bruce R. Larson, died at the scene. Two Massachusetts men in the Chrysler suffered serious injuries. The passenger, Martin V. Hyppolite, 22, of Malden, was taken by ambulance to a nearby hospital, and the driver, Ryan T. Merchant, 22, of Wakefield, had to be extricated from the wreckage.

"It took the rescue personnel 30 minutes to extract the driver of the Sebring. Once he was extracted, he was flown by helicopter to a Boston hospital," Kelly said.